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Helo, if I open my FM Radio app on my z3 it is just loading and loading, and I cant set a frequency.
How to fix this? 
Solved! Go to Solution.
The firmware of my z3 was corrupted, so i flashed it and with the new firmware it does work.
i have installed a modified sony fm radio app which does also work 
Settings-apps-all-radio,force stop and clear data. Restart.
Doesnt solve my problem... 
Does the same occur in safe mode?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Good to know.